Learn about this topic in these articles:

gibbons

...but the male does so much more rapidly. Kloss’s gibbon (
H. klossii), from the Mentawai Islands west of Sumatra, is completely black throughout its life. The sexes look alike in the
silvery gibbon (
H. moloch) of Java and in the white-bearded (
H. albibarbis) and Müller’s (
H. muelleri) gibbons, both from different parts of...